China’s huge cities are infamous—not just for their 50-lane traffic jams, but for the air pollution that clogs city skies, endangering health, provoking red alerts and even obscuring the view of Beijing from space.

Those quotes have put Jose Mourinho and Arsene Wenger on red alert over his possible availability, but the duo would have to stump up a fair amount of cash to prise him away if Dortmund's sporting director has any say in the matter.

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'red alert.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.